Sanmentan Fm
Type Locality and Naming
The type section is located at the area near Sanmentan of Xiashanxu Village, Yudu County, Jiangxi Province.
It was named by Geological Team of Jiangxi.
Lithology and Thickness
Mudstone, sandstone. Lower part of the Sanmentan Formation is composed of yellow calcareous mudstone and grayish-white feldspar quartz sandstone.
Upper part consists of grayish-white, grayish-green, purplish-red, and yellowish-green coarse-grained sandstone, fine-grained sandstone and siltstone.
The thickness is 455 m.
Relationships and Distribution
Lower contact
The unit is in conformable contact with the underlying Zhongpeng Fm.
Upper contact
The unit is in conformable contact with the overlying Lower Carboniferous.
Regional extent
GeoJSON
Fossils
Lower part of the Sanmentan Formation contains brachiopoda Yunnanella synplicata, Y. hunanensis, Cyrtospirifer cf. sinensis, Tenticospirifer sp.
Upper part of the formation yields flora Leptophloeum rhombicum, Sublepidodendron mirabile, S. wushiense, Lepidodtrobus grabaui.
Age
Depositional setting
Additional Information